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유진홍 대한화학요법학회 2002 대한화학요법학회지 Vol.20 No.2
1. 농도 의존성 항생제인 aminoglocoside는 하루 용량을 한 번에 투여하는 것이 치료 성공률 및 독성의 방지에 유리할 것이다. 단, Table 3에 제시된 적응증에 따라서 잘 선별해야 한다. 치료 성공을 기대할 수 있는 약리 역동학적 지표는 Peak/MIC ratio > 8-10 이다. 2. Fluoroquinolones는 농도 의존성 항생제이지만 하루 용량을 한 번에 투여하는 것은 중추신경계 독성이 높아질 우려가 있으므로 추천되지 않는다. 치료 성공을 위한 약리 약동학적 지표는 AUIC_(24) (AUC/MIC) >125 이다. 3. 시간 의존성 항생제인 β-lactamase은 time > MIC가 적어도 40%를 넘어야 치료 효과를 기대할 수 있다. 이를 위해서 투여 간격은 반감기의 3-4배 이내로 하거나 하루 종일 지속적으로 투여할 수 있다. 4. 또 다른 시간 의존성 항생제인 vancomycin과 azithromycin은 긴 PAE 때문에 AUIC_(24)를 지표로 삼는다.
Characterization of a Constitutive β-Lactamase from a Pseudomonas aeruginosa
유진홍,허동호,최정현,김양리,신원식,강문원 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.2
Objective : We analyzed some physicochermical chracteristics of a constitutive β-lactamase from a clinical isolate of a Pseudomonas aeruginosa which resistant to various β-lactams except imipenem and susceptible to aminoglycosides the proportion of its contribution to such resistance profile. Method : 1. Antimicrobial susceptibility test was done by the broth dilution method. 2. In hibition profile was done using EDTA, HgCl₂ and p-chloromercuribenzoate (pCMB). We also measured 50% inhibitory concentration(IC??) using β-lactamase inhibitors, such as clavulanic acid, sulbactam. 3. Kinetics study for substrate profile was performed by spectrophotometric assay using crude extracts and various antimicrobial agents. Relative hydropysis rates were determined. 4. The isoelectric point(pI) was determined by isoelectric focusing. The molecular weight was estimated by SDS-polycrylamide gel electrophoresis. Results : 1. The strain was resistant to ceftriaxone, sulperazon, piperacillin, ceftazidime, and aztreonam, while it was susceptible to gontamicin, tobramycin, amikacin and imipenem. 2. The β-lactamase was not inhibited by EDTA, and pCMB, whereas it was inhibited by HgCI₂. The IC?? of clavulanic acid was over 100μM and that of sulbactam was 22μM. 3. The relative maximal hydrolysis rate was calculated by setting V_(max) for cephaloridine at 100. The enzyme hydrolyzed cephalosporins more rapidly than penicillins. 4. The pI was 9.3 by isoelectric focusing. The molecular weight was estimated to be 40kDa. Conclusion : According to its substrate profile, pI and molecular weight, the β-lactamase from a clinical isolate of P. aeruginosa was a cephalosporinase belonging to group 1 in the Bush-Jacoby-Medeiros classification scheme.